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Multiple-element transducers

F W Kremkau1

  • 1Center for Medical Ultrasound, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, NC 27157-1039.

Radiographics : a Review Publication of the Radiological Society of North America, Inc
|September 1, 1993
PubMed
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Ultrasound arrays, groups of transducer elements, enable electronic beam steering and focusing for improved image quality. Different array types like linear, convex, and annular offer distinct capabilities for medical imaging applications.

Area of Science:

  • Ultrasound technology
  • Medical imaging
  • Transducer arrays

Background:

  • Ultrasound arrays, or transducer elements, are crucial for medical imaging.
  • Array nomenclature often uses incomplete descriptions (e.g., linear array) instead of full names (e.g., linear sequenced array).
  • Arrays are configured linearly (linear, convex) or in concentric rings (annular).

Purpose of the Study:

  • To describe the construction and operation of multiple-element ultrasound transducer arrays.
  • To explain the capabilities and limitations of different array types.
  • To highlight methods for enhancing ultrasound image quality using arrays.

Main Methods:

  • Description of array configurations: linear, convex, and annular.
  • Explanation of electronic beam steering and focusing capabilities.

Related Experiment Videos

  • Discussion of image formats (rectangle, parallelogram, sector) and quality improvement techniques (dynamic aperture, apodization).

    • Main Results:

    • Arrays electronically scan ultrasound beams without mechanical parts, unlike the annular array which offers 2D focusing but no steering.
    • Electronic focusing at various depths creates a long focal region, enhancing image detail.
    • Techniques like dynamic aperture and apodization further refine image quality.

    Conclusions:

    • Ultrasound arrays offer advanced electronic control over beam steering and focusing.
    • Various array configurations provide different imaging modalities and capabilities.
    • Electronic focusing and other techniques significantly improve diagnostic ultrasound image quality.